Question 1

Which of the following is an important density-independent factor limiting population size?

Accepted Answer

A) predation 
B) weather 
C) environmental resistance 
D) competition 
E) quantity of food 
A) predation 
B) weather 
C) environmental resistance 
D) competition 
E) quantity of food

Question 2

When a population has inhabited an area for a long time and the population size has stabilized because of space and food limitations:

Accepted Answer

A) the carrying capacity of the area has been reached. 
B) density dependence is clearly not involved in the population growth. 
C) predation decreases. 
D) density-independent factors are involved. 
E) the environmental resistance declines. 
A) the carrying capacity of the area has been reached. 
B) density dependence is clearly not involved in the population growth. 
C) predation decreases. 
D) density-independent factors are involved. 
E) the environmental resistance declines.

Question 3

The different species within an ecosystem that interact in various ways make up a(n):

Accepted Answer

A) population. 
B) community. 
C) trophic level. 
D) aggregation. 
E) ecotone. 
A) population. 
B) community. 
C) trophic level. 
D) aggregation. 
E) ecotone.

Question 4

How does the environment limit population growth?

Accepted Answer

Competition, predation, limits

Question 5

Write an equation that describes a situation in which a population remains stable.

Accepted Answer

Birth + immigration = death +

Question 6

The United Nations estimates that by 2050, the world's population may reach over ________ billion and still be growing.

Accepted Answer

A) 7)0 
B) 9)0 
C) 12.4 
D) 15.6 
E) 20.5 
A) 7)0 
B) 9)0 
C) 12.4 
D) 15.6 
E) 20.5

Question 7

If the individuals of a species are very likely to live until old age, that species exhibits a(n)________ survivorship curve.

Accepted Answer

A) convex 
B) constant 
C) concave 
D) S-shaped 
E) declining 
A) convex 
B) constant 
C) concave 
D) S-shaped 
E) declining

Question 8

Americans use about ________ times as much energy as the world average.

Accepted Answer

A) 1)5 
B) 2 
C) 5 
D) 10 
E) 20 
A) 1)5 
B) 2 
C) 5 
D) 10 
E) 20

Question 9

In the equation "population growth = r × N," the letter r stands for ________.

Accepted Answer

The answer of In the equation "population growth = r...

Question 10

In a population of lemmings, a sudden freeze that caused many of the lemmings to die is an example of a:

Accepted Answer

A) nonliving and density-independent factor. 
B) living and density-dependent factor. 
C) nonliving and density-dependent factor. 
D) living and density-independent factor. 
E) normal boom-and-bust cycle. 
A) nonliving and density-independent factor. 
B) living and density-dependent factor. 
C) nonliving and density-dependent factor. 
D) living and density-independent factor. 
E) normal boom-and-bust cycle.

Question 11

Parasites often kill their hosts, although they do not directly benefit from their hosts' death. Yet many ecologists believe that parasites may have beneficial effects on their host populations. Why?

Accepted Answer

Parasites tend to destroy weaker and les

Question 12

A complex, interrelated network of organisms and the surrounding nonliving environment in a defined area is a(n):

Accepted Answer

A) community. 
B) ecosystem. 
C) population. 
D) biosphere. 
E) biome. 
A) community. 
B) ecosystem. 
C) population. 
D) biosphere. 
E) biome.

Question 13

Some predators feed preferentially on the most abundant prey. This is an example of ________ predation.

Accepted Answer

A) density-dependent 
B) density-independent 
C) competitive 
D) exponential 
E) cyclical 
A) density-dependent 
B) density-independent 
C) competitive 
D) exponential 
E) cyclical

Question 14

All members of a species that reside within an ecosystem make up a(n):

Accepted Answer

A) population. 
B) community. 
C) trophic level. 
D) aggregation. 
E) ecotone. 
A) population. 
B) community. 
C) trophic level. 
D) aggregation. 
E) ecotone.

Question 15

A population size will remain stable if:

Accepted Answer

A) the number of births each year is constant and the birth rate is higher than the death rate. 
B) the population grows by a fixed percentage of its size each year. 
C) the rate of emigration is higher than the rate of immigration. 
D) the birth and death rates are equal, as are the rates of emigration and immigration. 
E) environmental resistance declines each year. 
A) the number of births each year is constant and the birth rate is higher than the death rate. 
B) the population grows by a fixed percentage of its size each year. 
C) the rate of emigration is higher than the rate of immigration. 
D) the birth and death rates are equal, as are the rates of emigration and immigration. 
E) environmental resistance declines each year.

Question 16

How does environmental resistance affect a population?

Accepted Answer

Environmental resist

Question 17

Humans are classified as a late-loss population. True or False?

Accepted Answer

A) True 
 B)False

Question 18

In ________ competition, one organism uses social or chemical interactions to limit the access of other individuals to resources.

Accepted Answer

A) contest 
B) scramble 
C) interspecific 
D) intramural 
E) social 
A) contest 
B) scramble 
C) interspecific 
D) intramural 
E) social

Question 19

In areas that have a stable population, the number of children born in a period of time is:

Accepted Answer

A) increasing. 
B) decreasing. 
C) approximately equal to the number of adults. 
D) higher than the number of adults. 
E) lower than the number of adults. 
A) increasing. 
B) decreasing. 
C) approximately equal to the number of adults. 
D) higher than the number of adults. 
E) lower than the number of adults.

Question 20

What might cause a uniform population distribution?

Accepted Answer

A) the need for a group to care for its offspring 
B) allelopathy (the release of chemicals by plants to inhibit the growth of other plants nearby) 
C) localization of resources 
D) the need to find a mate 
E) scarce resources 
A) the need for a group to care for its offspring 
B) allelopathy (the release of chemicals by plants to inhibit the growth of other plants nearby) 
C) localization of resources 
D) the need to find a mate 
E) scarce resources

Exam 26: Population Growth and Regulation

Which of the following is an important density-independent factor limiting population size?

When a population has inhabited an area for a long time and the population size has stabilized because of space and food limitations:

The different species within an ecosystem that interact in various ways make up a(n):

How does the environment limit population growth?

Write an equation that describes a situation in which a population remains stable.

The United Nations estimates that by 2050, the world's population may reach over ________ billion and still be growing.

If the individuals of a species are very likely to live until old age, that species exhibits a(n)________ survivorship curve.

Americans use about ________ times as much energy as the world average.

In the equation "population growth = r × N," the letter r stands for ________.

In a population of lemmings, a sudden freeze that caused many of the lemmings to die is an example of a:

Parasites often kill their hosts, although they do not directly benefit from their hosts' death. Yet many ecologists believe that parasites may have beneficial effects on their host populations. Why?

A complex, interrelated network of organisms and the surrounding nonliving environment in a defined area is a(n):

Some predators feed preferentially on the most abundant prey. This is an example of ________ predation.

All members of a species that reside within an ecosystem make up a(n):

A population size will remain stable if:

How does environmental resistance affect a population?

Humans are classified as a late-loss population. True or False?

In ________ competition, one organism uses social or chemical interactions to limit the access of other individuals to resources.

In areas that have a stable population, the number of children born in a period of time is:

What might cause a uniform population distribution?

An Introduction to Life on Earth

Atoms, Molecules, and Life

Biological Molecules

Cell Structure and Function

Cell Membrane Structure and Function

Energy Flow in the Life of a Cell

Capturing Solar Energy: Photosynthesis

Harvesting Energy: Glycolysis and Cellular Respiration

The Continuity of Life: Cellular Reproduction

Patterns of Inheritance

Dna: the Molecule of Heredity

Gene Expression and Regulation

Biotechnology

Principles of Evolution

How Populations Evolve

The Origin of Species

The History of Life

Systematics: Seeking Order Amidst Diversity

The Diversity of Prokaryotes and Viruses

The Diversity of Protists

The Diversity of Plants

The Diversity of Fungi

Animal Diversity I: Invertebrates

Animal Diversity Ii: Vertebrates

Animal Behavior

Community Interactions

How Do Ecosystems Work

Earths Diverse Ecosystems

Conserving Earths Biodiversity

Homeostasis and the Organization of the Animal Body

Circulation

Respiration

Nutrition and Digestion

The Urinary System

Defenses Against Disease

Chemical Control of the Animal Body: the Endocrine System

The Nervous System

The Senses

Action and Support: the Muscles and Skeleton

Animal Reproduction

Animal Development

Plant Anatomy and Nutrient Transport

Plant Reproduction and Development

Plant Responses to the Environment

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